The Vibra Probe 580 Pinpointer is fully waterproof, and can be used underwater up to 100 feet. The Vibra Probe 580 Pinpointer is an accessory to a metal detector, and will help you quickly and precisely locate your target. It works on vibration in order to narrow your search, and is turned on or off by pointing to the sky. These devices are best used when searching for items close to the surface. It will save you a lot of time from potentially digging recently lost objects.